dsa1 min read
Most Common Word — Normalize + Frequency Map
Find the most common word not in a banned list by normalizing input and using a frequency counter.
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Hand of Straights — Greedy with Ordered Frequency Map
Determine if cards can be rearranged into consecutive groups of size groupSize using a sorted frequency map.
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Subarray Sum Divisible by K — Prefix Mod HashMap
Count subarrays with sum divisible by k using prefix mod frequencies and the complement map pattern.
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Count Good Meals — Power-of-Two Complement HashMap
Count pairs summing to a power of 2 by checking all 22 powers-of-2 against a running frequency map.
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Time Based Key-Value Store — HashMap + Binary Search
Design a time-stamped key-value store supporting set and get(key, timestamp) using binary search on sorted timestamps.
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